A NCAA study on the gambling habits of male athletes found that college golfers were more than twice as likely to be involved in sports betting than any other college sportsmen. Global Risk Briefing Road to Brexit: Walters received insider tips from Tom C. Phil MickelsonQuick Shots. Mickelson was ruled out as a witness in the Walters case when prosecutors were told he would invoke the Fifth Amendment if compelled to testify.CHASKA, MN - SEPTEMBER Phil Mickelson of the United States Walters, a legendary Las Vegas gambler and golf buddy of Mickelson. Wherever Phil lays his bets is his home. during the trial of Billy Walters, a Las Vegas gambler and longtime pal of the golf superstar. Walters. Professional golfer Phil Mickelson paid Las Vegas sports gambler $ million after cashing in on a stock tip that's part of an insider-trading.